This paper presents the design and development of low cost archetype dual rotor helicopter (LCADRH) for academic research in an educational institution. The LCADRH is installed with optical pitch encoder and yaw ...This paper presents the design and development of low cost archetype dual rotor helicopter (LCADRH) for academic research in an educational institution. The LCADRH is installed with optical pitch encoder and yaw encoder which measure elevation and side to side motion of helicopter. The objective of the project is to design and integrate the helicopter with data acquisition board and sensors to provide hardware features, software support capability for its rapid real time measurement and control. The low cost designed LCADRH facilitates the academic research for students in the institution and is able to provide hands on training to understand the concept of nonlinearity, system modelled and unmodelled dynamics and uncertainty, modelling, simulation and control by doing practical experiments. The mathematical model of the LCADRH is derived using grey box modelling method. The control of LCADRH is challenging due to its nonlinearity and effect of strong coupling between aerodynamic forces and torques generated by the both pitch and yaw actuators. In closed loop position control of LCADRH, pitch and yaw axis motion is regulated using linear quadratic controller (LQR). Encouraging results are obtained both in simulation and hardware.展开更多
主动磁悬浮轴承(Active Magnetic Bearing, AMB)对转子的加工精度要求很高,圆度误差是转子加工中常见的误差,但是前人的工作中关于圆度误差影响的研究很少。建立了四自由度AMB的数学模型,分析了圆度误差对力-电流系数和力-位移系数的影...主动磁悬浮轴承(Active Magnetic Bearing, AMB)对转子的加工精度要求很高,圆度误差是转子加工中常见的误差,但是前人的工作中关于圆度误差影响的研究很少。建立了四自由度AMB的数学模型,分析了圆度误差对力-电流系数和力-位移系数的影响,推导了四自由度AMB的闭环特征方程。通过闭环特征方程的性质,分析了圆度误差对四自由度AMB稳定性的影响,通过仿真和实验验证了上述分析的正确性。研究结果表明,过大的圆度误差会使四自由度AMB系统不稳定,但通过选取合适的PID参数能够使系统恢复稳定。展开更多
文摘This paper presents the design and development of low cost archetype dual rotor helicopter (LCADRH) for academic research in an educational institution. The LCADRH is installed with optical pitch encoder and yaw encoder which measure elevation and side to side motion of helicopter. The objective of the project is to design and integrate the helicopter with data acquisition board and sensors to provide hardware features, software support capability for its rapid real time measurement and control. The low cost designed LCADRH facilitates the academic research for students in the institution and is able to provide hands on training to understand the concept of nonlinearity, system modelled and unmodelled dynamics and uncertainty, modelling, simulation and control by doing practical experiments. The mathematical model of the LCADRH is derived using grey box modelling method. The control of LCADRH is challenging due to its nonlinearity and effect of strong coupling between aerodynamic forces and torques generated by the both pitch and yaw actuators. In closed loop position control of LCADRH, pitch and yaw axis motion is regulated using linear quadratic controller (LQR). Encouraging results are obtained both in simulation and hardware.
文摘主动磁悬浮轴承(Active Magnetic Bearing, AMB)对转子的加工精度要求很高,圆度误差是转子加工中常见的误差,但是前人的工作中关于圆度误差影响的研究很少。建立了四自由度AMB的数学模型,分析了圆度误差对力-电流系数和力-位移系数的影响,推导了四自由度AMB的闭环特征方程。通过闭环特征方程的性质,分析了圆度误差对四自由度AMB稳定性的影响,通过仿真和实验验证了上述分析的正确性。研究结果表明,过大的圆度误差会使四自由度AMB系统不稳定,但通过选取合适的PID参数能够使系统恢复稳定。
